Search found 35 matches

by Karina Vasquez 1D
Wed Jul 31, 2019 2:17 am
Forum: Ionic & Covalent Bonds
Topic: Boiling Point
Replies: 2
Views: 178

Re: Boiling Point

A way I determine a higher boiling point is by figuring out if there is a hydrogen bond in the molecule because hydrogen bonds tend to have higher boiling points.
by Karina Vasquez 1D
Tue Jul 30, 2019 5:48 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Shape in coordination compound
Replies: 2
Views: 113

Shape in coordination compound

In the question below it asks to write the name and to name the shape, what would be an easy way to figure out the shape of this compound?
Write the name of the coordination compound Na​3 [​Co(C​2O​4)​​3]​ , and name the shape of this coordination compound.
by Karina Vasquez 1D
Mon Jul 29, 2019 6:19 pm
Forum: Naming
Topic: Cation/Anion
Replies: 3
Views: 115

Cation/Anion

When naming a coordination compound such as K3Fe(CN)6 how would I know which is the cation and which is the anion?
by Karina Vasquez 1D
Mon Jul 29, 2019 4:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Increasing bond angles
Replies: 1
Views: 97

Increasing bond angles

What does it mean when a question asks to rank in order of increasing HCH bond angles?
by Karina Vasquez 1D
Mon Jul 29, 2019 3:40 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Ranking anions/cations
Replies: 2
Views: 191

Ranking anions/cations

When ranking say anions from least to greatest polarizability how does the charge determine where it would be placed when ranked? For example, ranking I-, Cl-, S2-, P3- how does the charge determine which of S2- and P3- will be ranked first (least to most polarizable)?
by Karina Vasquez 1D
Sat Jul 27, 2019 9:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 6th edition ch. 4
Replies: 1
Views: 104

6th edition ch. 4

4.111 Acetonitrile, CH3CN, is used as a solvent in the pharmaceutical industry. Describe the structure of the CH3CN molecule in terms of hybrid orbitals, bond angles, and sigma and pi bonds. The N atom is a terminal atom. How would I describe the structure in terms of using sigma and pi bonds? Would...
by Karina Vasquez 1D
Sat Jul 27, 2019 8:47 pm
Forum: Conjugate Acids & Bases
Topic: J. 19 6th edition
Replies: 1
Views: 115

J. 19 6th edition

J.19 The oxides of nonmetallic elements are called acidic oxides because they form acidic solutions in water. Write the balanced chemical equations for the reaction of 1 mol of formula units of each acidic oxide with 1 mol of water molecules to form an oxoacid and name the acid formed: (a) CO2; (b) ...
by Karina Vasquez 1D
Sat Jul 27, 2019 8:31 pm
Forum: Bronsted Acids & Bases
Topic: topic
Replies: 3
Views: 157

Re: topic

Here are the final material that will be tested: Chemical Bonds Molecular Shape and Structure Coordination Compounds and their Biological Importance Acid and Base Structures and Properties In the topic of Coordination Compounds and their Biological Importance we have to know how to name certain com...
by Karina Vasquez 1D
Sat Jul 27, 2019 8:29 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Compound 6th edition
Replies: 2
Views: 116

Coordination Compound 6th edition

17.29 Name each of the following complex ions and determine the oxidation number of the metal: (a) [Fe(CN)6]^4-; (b) [Co(NH3)6]^3+; (c) [Co(CN)5(OH2)]^-2; (d) [Co(SO4)(NH3)5]^+.

Can someone explain how to solve this problem step-by-step?
by Karina Vasquez 1D
Sat Jul 27, 2019 8:09 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation states
Replies: 5
Views: 141

Re: Oxidation states

205458163 wrote:You can calculate the oxidation state of a certain atom by using the sum of all positive and negative equal to 0.

What do you mean by using the "sum of all positive and negative equal to 0"?
by Karina Vasquez 1D
Sat Jul 27, 2019 7:52 pm
Forum: Lewis Structures
Topic: Complete Lewis Structure [ENDORSED]
Replies: 6
Views: 304

Re: Complete Lewis Structure [ENDORSED]

Ok thank you for explaining!!!
by Karina Vasquez 1D
Sat Jul 20, 2019 7:53 pm
Forum: Ionic & Covalent Bonds
Topic: Inter and Intra
Replies: 8
Views: 260

Re: Inter and Intra

Is there a way to memorize the forces in intermolecular and intramolecular forces? Ex: hydrogen and/or vander waal interactions.
by Karina Vasquez 1D
Sat Jul 20, 2019 7:37 pm
Forum: Lewis Structures
Topic: Complete Lewis Structure [ENDORSED]
Replies: 6
Views: 304

Re: Complete Lewis Structure [ENDORSED]

Ok thank you!
Also I don't really understand how to apply the formal charge or partial charge. What is the difference?
by Karina Vasquez 1D
Thu Jul 18, 2019 6:04 am
Forum: Lewis Structures
Topic: Central Atom
Replies: 3
Views: 146

Central Atom

Can fluorine, chlorine, or any atom in group 17 ever be the central atom? Is it just fluorine that can't be a central atom?
by Karina Vasquez 1D
Wed Jul 17, 2019 5:24 pm
Forum: Lewis Structures
Topic: Complete Lewis Structure [ENDORSED]
Replies: 6
Views: 304

Complete Lewis Structure [ENDORSED]

When a question asks to find the complete lewis structure, does that mean finding the formal charge as well?
For example in the 6th edition of the book question 3.39 says to write the complete Lewis structure for the following compound (a) ammonium chloride. Do I look for the formal charge as well?
by Karina Vasquez 1D
Wed Jul 17, 2019 3:57 pm
Forum: Resonance Structures
Topic: Resonance Hybrid
Replies: 3
Views: 234

Resonance Hybrid

Will we need to know how to figure out the resonance hybrid for lewis structures?
by Karina Vasquez 1D
Wed Jul 17, 2019 3:12 pm
Forum: Lewis Structures
Topic: Lewis Structures for Ions
Replies: 1
Views: 145

Lewis Structures for Ions

When drawing the lewis structure for an ion, for example CN^-, after we are finished adding the other electron do we put the the lewis structure in brackets to represent the number of electrons added? In this case it would be one?
by Karina Vasquez 1D
Sat Jul 13, 2019 6:14 pm
Forum: Octet Exceptions
Topic: Expanded octet
Replies: 3
Views: 190

Expanded octet

Can someone explain the concept of certain elements being able to break the octet rule?
by Karina Vasquez 1D
Sat Jul 13, 2019 6:10 pm
Forum: Lewis Structures
Topic: Valence electrons
Replies: 4
Views: 155

Re: Valence electrons

Elements in the d block are transition metals, so they normally express valence electron from the s orbital. For example, Fe has 2 valence electrons because the electron configuration is 1s^2 2s^2 2p6 3s2 3p^6 4s^2 3d^5. Notice that both ns^2 have 2 electrons so we have 2 valence electrons. Another...
by Karina Vasquez 1D
Fri Jul 12, 2019 2:40 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration for 1st row transition metals
Replies: 6
Views: 206

Re: Electron Configuration for 1st row transition metals

Ok thank you! Also, should we know/memorize the exceptions of ionic charges for transitional metals?
by Karina Vasquez 1D
Wed Jul 10, 2019 5:34 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 6th edition chapter 3 problem 9
Replies: 2
Views: 135

6th edition chapter 3 problem 9

Which M^2+ ions (where M is a metal) are predicted to have the following ground-state electron configurations: (a) [Ar]3d7; (b) [Ar]3d6 I don't understand how to begin finding M because are the 2+ electrons lost already or do we apply it to the following? Assuming its the latter would I take from 4s...
by Karina Vasquez 1D
Wed Jul 10, 2019 5:08 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration for 1st row transition metals
Replies: 6
Views: 206

Electron Configuration for 1st row transition metals

Are the only special cases when completing ground state electron configuration Cu and Cr or is it all of the first row of transition metals?
by Karina Vasquez 1D
Tue Jul 09, 2019 5:23 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg's equation for midterm
Replies: 1
Views: 120

Rydberg's equation for midterm

Will we need to and should we use rydberg's equations for the midterm? Is there a possibility that we will need to use this equation to solve for a problem?
by Karina Vasquez 1D
Sat Jul 06, 2019 2:12 pm
Forum: Empirical & Molecular Formulas
Topic: Molar Mass vs. Atomic Weight
Replies: 7
Views: 331

Re: Molar Mass vs. Atomic Weight

From what I know molar mass and atomic weight are numerically equivalent, although they have different units. So the unit for atomic weight is amu and molar mass would be in g/mol. Hope that helped!
by Karina Vasquez 1D
Sat Jul 06, 2019 1:22 pm
Forum: Quantum Numbers and The H-Atom
Topic: 6th edition chapter 2 number 19
Replies: 1
Views: 156

6th edition chapter 2 number 19

2.19 (a) How many values of the quantum number l are possible when n=7? (b) How many values of ml are allowed for an electron in a 6d-subshell? (c) How many values of ml are allowed for an electron in a 3p-subshell? (d) How many subshells are there in the shell with n =4? Can someone explain step-by...
by Karina Vasquez 1D
Sat Jul 06, 2019 12:51 pm
Forum: Photoelectric Effect
Topic: Photoelectric effect answer
Replies: 2
Views: 170

Re: Photoelectric effect answer

Ok, thank you!
by Karina Vasquez 1D
Fri Jul 05, 2019 3:45 pm
Forum: Photoelectric Effect
Topic: Photoelectric effect answer
Replies: 2
Views: 170

Photoelectric effect answer

When answering a question about the wavelength (ex: maximum) in a photoelectric problem, would the answer be in m or nm? Should I have both?
by Karina Vasquez 1D
Fri Jul 05, 2019 1:40 pm
Forum: Properties of Light
Topic: Main experimental results
Replies: 2
Views: 161

Re: Main experimental results

Thank you so much!
by Karina Vasquez 1D
Wed Jul 03, 2019 4:34 pm
Forum: Properties of Light
Topic: Main experimental results
Replies: 2
Views: 161

Main experimental results

Just to clarify, when the experimental results were gathered they found that the intensity of light is proportional to the number of photons , BUT when talking about light as a wave then the intensity of the wave is associated with the amplitude of the wave which would not be correct? So intensity o...
by Karina Vasquez 1D
Sat Jun 29, 2019 7:59 pm
Forum: Limiting Reactant Calculations
Topic: How to distinguish limiting or excess reactant.
Replies: 4
Views: 197

Re: How to distinguish limiting or excess reactant.

Is there a particular way to find the reactants? Can you write the steps (break them down) to find the limiting reactant please.
by Karina Vasquez 1D
Sat Jun 29, 2019 7:54 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Equations
Replies: 4
Views: 349

Re: Balancing Equations

What if the substances were different? Would you only add the moles from a particular substance that is asked for?
by Karina Vasquez 1D
Sat Jun 29, 2019 7:51 pm
Forum: Properties of Light
Topic: wavelength
Replies: 11
Views: 543

Re: wavelength

How would you go about finding the amplitude?
by Karina Vasquez 1D
Sat Jun 29, 2019 7:42 pm
Forum: Properties of Light
Topic: Frday's lecture
Replies: 4
Views: 208

Re: Frday's lecture

I know this doesn't really have to do with the question, but how do you find the threshold energy, or would it always be given? In a vague way? So for example, in the second question from the lecture I'm assuming the threshold is 3.61 x 10^-19 J. Is that going to be the threshold unless it explicitl...
by Karina Vasquez 1D
Sat Jun 29, 2019 7:19 pm
Forum: Empirical & Molecular Formulas
Topic: Combustion Analysis Problem
Replies: 1
Views: 169

Combustion Analysis Problem

A compound consists only of Carbon, Hydrogen, and Oxygen. 8.272 g of CO2 and 4.515 g of H2O are produced during complete combustion of 3.765g of the compound. a) What is the empirical formula of the compound? b) What is the molecular formula if the molar mass of the compound is 300. 47 g/mol? I know...
by Karina Vasquez 1D
Sat Jun 29, 2019 6:51 pm
Forum: Student Social/Study Group
Topic: Test Studying Strategies
Replies: 6
Views: 220

Re: Test Studying Strategies

One thing I do a few days prior to taking an exam is make a list of what I know and don't know, that way I can be sure not to miss anything. Using the worksheets provided by the UA's, modules, and fundamentals section is what I use to study. What really helps me is watching videos that really breakd...

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